The Effects of Stark Broadening in the Radio Recombination Line Temperatures

Details The Effects of Stark Broadening in the Radio Recombination Line Temperatures The Effects of Stark Broadening in the Radio Recombination Line Temperatures

Jan 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973ap%26ss..20..187s&link_type=abstract

Astrophysics and Space Science, Volume 20, Issue 1, pp.187-203

Astronomy and Astrophysics

Astrophysics

10

Scientific paper

Observations of Orion A, M 17, and W 3 made at the National Radio Astronomy Observatory show Stark broadening in the α, β, and γ hydrogen recombination lines at 22 cm. Stark effect has such a large effect on the line profiles that fitted Gaussian profiles cannot be used to measure the area of the line. Theoretical line profiles have been derived from model Hii regions. Voigt profiles fitted to the theoretical line profiles indicate that the areas of the lines derived from the fitted profiles may be systematically too small. Using Voigt profiles fitted by least squares to the observations, we found that the line intensities at 22 cm agree with the intensity ratios predicted by LTE theory.

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